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minio/cmd/utils.go

415 lines
11 KiB

/*
* Minio Cloud Storage, (C) 2015, 2016, 2017 Minio, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package cmd
import (
"bytes"
"context"
"crypto/tls"
"encoding/base64"
"encoding/json"
"encoding/xml"
"fmt"
"io"
"io/ioutil"
"net"
"net/http"
"net/url"
"os"
"reflect"
"strings"
"sync"
"time"
"github.com/minio/minio/cmd/logger"
"github.com/minio/minio/pkg/handlers"
humanize "github.com/dustin/go-humanize"
"github.com/gorilla/mux"
"github.com/pkg/profile"
)
// IsErrIgnored returns whether given error is ignored or not.
func IsErrIgnored(err error, ignoredErrs ...error) bool {
return IsErr(err, ignoredErrs...)
}
// IsErr returns whether given error is exact error.
func IsErr(err error, errs ...error) bool {
for _, exactErr := range errs {
if err == exactErr {
return true
}
}
return false
}
// Close Http tracing file.
func stopHTTPTrace() {
if globalHTTPTraceFile != nil {
reqInfo := (&logger.ReqInfo{}).AppendTags("traceFile", globalHTTPTraceFile.Name())
ctx := logger.SetReqInfo(context.Background(), reqInfo)
logger.LogIf(ctx, globalHTTPTraceFile.Close())
globalHTTPTraceFile = nil
}
}
// make a copy of http.Header
func cloneHeader(h http.Header) http.Header {
h2 := make(http.Header, len(h))
for k, vv := range h {
vv2 := make([]string, len(vv))
copy(vv2, vv)
h2[k] = vv2
}
return h2
}
// Convert url path into bucket and object name.
func urlPath2BucketObjectName(path string) (bucketName, objectName string) {
// Trim any preceding slash separator.
urlPath := strings.TrimPrefix(path, slashSeparator)
// Split urlpath using slash separator into a given number of
// expected tokens.
tokens := strings.SplitN(urlPath, slashSeparator, 2)
bucketName = tokens[0]
if len(tokens) == 2 {
objectName = tokens[1]
}
// Success.
return bucketName, objectName
}
// URI scheme constants.
const (
httpScheme = "http"
httpsScheme = "https"
)
// xmlDecoder provide decoded value in xml.
func xmlDecoder(body io.Reader, v interface{}, size int64) error {
var lbody io.Reader
if size > 0 {
lbody = io.LimitReader(body, size)
} else {
lbody = body
}
d := xml.NewDecoder(lbody)
return d.Decode(v)
}
// checkValidMD5 - verify if valid md5, returns md5 in bytes.
func checkValidMD5(h http.Header) ([]byte, error) {
md5B64, ok := h["Content-Md5"]
if ok {
if md5B64[0] == "" {
return nil, fmt.Errorf("Content-Md5 header set to empty value")
}
return base64.StdEncoding.DecodeString(md5B64[0])
}
return []byte{}, nil
}
/// http://docs.aws.amazon.com/AmazonS3/latest/dev/UploadingObjects.html
const (
// Maximum object size per PUT request is 5TB.
// This is a divergence from S3 limit on purpose to support
// use cases where users are going to upload large files
// using 'curl' and presigned URL.
globalMaxObjectSize = 5 * humanize.TiByte
// Minimum Part size for multipart upload is 5MiB
globalMinPartSize = 5 * humanize.MiByte
// Maximum Part size for multipart upload is 5GiB
globalMaxPartSize = 5 * humanize.GiByte
// Maximum Part ID for multipart upload is 10000
// (Acceptable values range from 1 to 10000 inclusive)
globalMaxPartID = 10000
// Default values used while communicating with the cloud backends
defaultDialTimeout = 30 * time.Second
defaultDialKeepAlive = 30 * time.Second
)
// isMaxObjectSize - verify if max object size
func isMaxObjectSize(size int64) bool {
return size > globalMaxObjectSize
}
// // Check if part size is more than maximum allowed size.
func isMaxAllowedPartSize(size int64) bool {
return size > globalMaxPartSize
}
// Check if part size is more than or equal to minimum allowed size.
func isMinAllowedPartSize(size int64) bool {
return size >= globalMinPartSize
}
// isMaxPartNumber - Check if part ID is greater than the maximum allowed ID.
func isMaxPartID(partID int) bool {
return partID > globalMaxPartID
}
func contains(slice interface{}, elem interface{}) bool {
v := reflect.ValueOf(slice)
if v.Kind() == reflect.Slice {
for i := 0; i < v.Len(); i++ {
if v.Index(i).Interface() == elem {
return true
}
}
}
return false
}
// Starts a profiler returns nil if profiler is not enabled, caller needs to handle this.
func startProfiler(profiler string) interface {
Stop()
} {
// Enable profiler if ``_MINIO_PROFILER`` is set. Supported options are [cpu, mem, block].
switch profiler {
case "cpu":
return profile.Start(profile.CPUProfile, profile.NoShutdownHook)
case "mem":
return profile.Start(profile.MemProfile, profile.NoShutdownHook)
case "block":
return profile.Start(profile.BlockProfile, profile.NoShutdownHook)
default:
return nil
}
}
// Global profiler to be used by service go-routine.
var globalProfiler interface {
Stop()
}
// dump the request into a string in JSON format.
func dumpRequest(r *http.Request) string {
header := cloneHeader(r.Header)
header.Set("Host", r.Host)
// Replace all '%' to '%%' so that printer format parser
// to ignore URL encoded values.
rawURI := strings.Replace(r.RequestURI, "%", "%%", -1)
req := struct {
Method string `json:"method"`
RequestURI string `json:"reqURI"`
Header http.Header `json:"header"`
}{r.Method, rawURI, header}
var buffer bytes.Buffer
enc := json.NewEncoder(&buffer)
enc.SetEscapeHTML(false)
if err := enc.Encode(&req); err != nil {
// Upon error just return Go-syntax representation of the value
return fmt.Sprintf("%#v", req)
}
// Formatted string.
return strings.TrimSpace(string(buffer.Bytes()))
}
// isFile - returns whether given path is a file or not.
func isFile(path string) bool {
if fi, err := os.Stat(path); err == nil {
return fi.Mode().IsRegular()
}
return false
}
// UTCNow - returns current UTC time.
func UTCNow() time.Time {
return time.Now().UTC()
}
// GenETag - generate UUID based ETag
func GenETag() string {
return ToS3ETag(getMD5Hash([]byte(mustGetUUID())))
}
// ToS3ETag - return checksum to ETag
func ToS3ETag(etag string) string {
etag = canonicalizeETag(etag)
if !strings.HasSuffix(etag, "-1") {
// Tools like s3cmd uses ETag as checksum of data to validate.
// Append "-1" to indicate ETag is not a checksum.
etag += "-1"
}
return etag
}
// NewCustomHTTPTransport returns a new http configuration
// used while communicating with the cloud backends.
// This sets the value for MaxIdleConnsPerHost from 2 (go default)
// to 100.
func NewCustomHTTPTransport() *http.Transport {
return &http.Transport{
Proxy: http.ProxyFromEnvironment,
DialContext: (&net.Dialer{
Timeout: defaultDialTimeout,
KeepAlive: defaultDialKeepAlive,
}).DialContext,
MaxIdleConns: 1024,
MaxIdleConnsPerHost: 1024,
IdleConnTimeout: 30 * time.Second,
TLSHandshakeTimeout: 10 * time.Second,
ExpectContinueTimeout: 1 * time.Second,
TLSClientConfig: &tls.Config{RootCAs: globalRootCAs},
DisableCompression: true,
}
}
// Load the json (typically from disk file).
func jsonLoad(r io.ReadSeeker, data interface{}) error {
if _, err := r.Seek(0, io.SeekStart); err != nil {
return err
}
return json.NewDecoder(r).Decode(data)
}
// Save to disk file in json format.
func jsonSave(f interface {
io.WriteSeeker
Truncate(int64) error
}, data interface{}) error {
b, err := json.Marshal(data)
if err != nil {
return err
}
if err = f.Truncate(0); err != nil {
return err
}
if _, err = f.Seek(0, io.SeekStart); err != nil {
return err
}
_, err = f.Write(b)
if err != nil {
return err
}
return nil
}
// ceilFrac takes a numerator and denominator representing a fraction
// and returns its ceiling. If denominator is 0, it returns 0 instead
// of crashing.
func ceilFrac(numerator, denominator int64) (ceil int64) {
if denominator == 0 {
// do nothing on invalid input
return
}
// Make denominator positive
if denominator < 0 {
numerator = -numerator
denominator = -denominator
}
ceil = numerator / denominator
if numerator > 0 && numerator%denominator != 0 {
ceil++
}
return
}
// Returns context with ReqInfo details set in the context.
func newContext(r *http.Request, w http.ResponseWriter, api string) context.Context {
vars := mux.Vars(r)
bucket := vars["bucket"]
object := vars["object"]
prefix := vars["prefix"]
if prefix != "" {
object = prefix
}
reqInfo := &logger.ReqInfo{
RequestID: w.Header().Get(responseRequestIDKey),
RemoteHost: handlers.GetSourceIP(r),
UserAgent: r.Header.Get("user-agent"),
API: api,
BucketName: bucket,
ObjectName: object,
}
return logger.SetReqInfo(context.Background(), reqInfo)
}
// isNetworkOrHostDown - if there was a network error or if the host is down.
func isNetworkOrHostDown(err error) bool {
if err == nil {
return false
}
switch err.(type) {
case *net.DNSError, *net.OpError, net.UnknownNetworkError:
return true
case *url.Error:
// For a URL error, where it replies back "connection closed"
if strings.Contains(err.Error(), "Connection closed by foreign host") {
return true
}
return true
default:
if strings.Contains(err.Error(), "net/http: TLS handshake timeout") {
// If error is - tlsHandshakeTimeoutError,.
return true
} else if strings.Contains(err.Error(), "i/o timeout") {
// If error is - tcp timeoutError.
return true
} else if strings.Contains(err.Error(), "connection timed out") {
// If err is a net.Dial timeout.
return true
} else if strings.Contains(err.Error(), "net/http: HTTP/1.x transport connection broken") {
return true
}
}
return false
}
var b512pool = sync.Pool{
New: func() interface{} {
buf := make([]byte, 512)
return &buf
},
}
// CloseResponse close non nil response with any response Body.
// convenient wrapper to drain any remaining data on response body.
//
// Subsequently this allows golang http RoundTripper
// to re-use the same connection for future requests.
func CloseResponse(respBody io.ReadCloser) {
// Callers should close resp.Body when done reading from it.
// If resp.Body is not closed, the Client's underlying RoundTripper
// (typically Transport) may not be able to re-use a persistent TCP
// connection to the server for a subsequent "keep-alive" request.
if respBody != nil {
// Drain any remaining Body and then close the connection.
// Without this closing connection would disallow re-using
// the same connection for future uses.
// - http://stackoverflow.com/a/17961593/4465767
bufp := b512pool.Get().(*[]byte)
defer b512pool.Put(bufp)
io.CopyBuffer(ioutil.Discard, respBody, *bufp)
respBody.Close()
}
}